[1] An analysis of daily-to-interannual variability in the surface pressure field of the Martian nothern hemisphere as given by a Martian climate model is presented. In an empirical orthogonal function (EOF) decomposition, the dominant first two modes of variability comprise a zonal wavenumber 1 fea...
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ftciteseerx:oai:CiteSeerX.psu:10.1.1.144.4452 2023-05-15T17:39:55+02:00 The Pennsylvania State University CiteSeerX Archives application/pdf http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.144.4452 http://www.gfdl.noaa.gov/reference/bibliography/2003/leroy0301.pdf en eng http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.144.4452 http://www.gfdl.noaa.gov/reference/bibliography/2003/leroy0301.pdf Metadata may be used without restrictions as long as the oai identifier remains attached to it. http://www.gfdl.noaa.gov/reference/bibliography/2003/leroy0301.pdf Meteorology and Atmospheric Dynamics Planetary meteorology text ftciteseerx 2016-01-07T15:04:57Z [1] An analysis of daily-to-interannual variability in the surface pressure field of the Martian nothern hemisphere as given by a Martian climate model is presented. In an empirical orthogonal function (EOF) decomposition, the dominant first two modes of variability comprise a zonal wavenumber 1 feature centered at 70 N latitude moving eastward with a period of 6 to 8 sols. This feature is a baroclinic wave and accounts for 53 % of the northern hemisphere non-stationary surface pressure variability, and, when active, has an amplitude of up to 2 % of local surface pressure. The third mode of the EOF decomposition is annular about the Martian north pole, is null southward of 70 N, and accounts for 7 % of the northern hemisphere nonstationary surface pressure variability. The baroclinic wave (EOFs 1 & 2) is active during northern hemisphere winter and spring, consistent with models of the Martian atmospheric circulation, and the annular mode (EOF 3) is active only at the onset and demise of the baroclinic feature. When active, it is not uncommon for the annular mode to reside in either its positive or negative state stably for 20 to 30 sols. It is postulated that baroclinic waves with longitudinal wavenumber 2, 3, and 4 act as a pump for the annular mode. The annular mode should not be present in MGS TES Text North Pole Unknown North Pole |
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English |
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Meteorology and Atmospheric Dynamics Planetary meteorology |
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Meteorology and Atmospheric Dynamics Planetary meteorology |
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Meteorology and Atmospheric Dynamics Planetary meteorology |
description |
[1] An analysis of daily-to-interannual variability in the surface pressure field of the Martian nothern hemisphere as given by a Martian climate model is presented. In an empirical orthogonal function (EOF) decomposition, the dominant first two modes of variability comprise a zonal wavenumber 1 feature centered at 70 N latitude moving eastward with a period of 6 to 8 sols. This feature is a baroclinic wave and accounts for 53 % of the northern hemisphere non-stationary surface pressure variability, and, when active, has an amplitude of up to 2 % of local surface pressure. The third mode of the EOF decomposition is annular about the Martian north pole, is null southward of 70 N, and accounts for 7 % of the northern hemisphere nonstationary surface pressure variability. The baroclinic wave (EOFs 1 & 2) is active during northern hemisphere winter and spring, consistent with models of the Martian atmospheric circulation, and the annular mode (EOF 3) is active only at the onset and demise of the baroclinic feature. When active, it is not uncommon for the annular mode to reside in either its positive or negative state stably for 20 to 30 sols. It is postulated that baroclinic waves with longitudinal wavenumber 2, 3, and 4 act as a pump for the annular mode. The annular mode should not be present in MGS TES |
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The Pennsylvania State University CiteSeerX Archives |
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http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.144.4452 http://www.gfdl.noaa.gov/reference/bibliography/2003/leroy0301.pdf |
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North Pole |
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North Pole |
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http://www.gfdl.noaa.gov/reference/bibliography/2003/leroy0301.pdf |
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http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.144.4452 http://www.gfdl.noaa.gov/reference/bibliography/2003/leroy0301.pdf |
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